Compositions of steel-microfiber reinforced ultra high performance concrete (UHPC) using recycled glass powder and processes for making the same

A process for making a microfiber-containing hydrated ultra high performance concrete (UHPC) paste, comprising:

• (i). preparing a UHPC dry mix by mixing sand 28-32 weight %, cement 28-32 weight % having a Blaine fineness of about 3000-4500 cm2/g, silica fume 12-14 weight %, silica flour 7.0-9.0 weight %, and microinclusions, wherein the microinclusions are selected from one or more the group consisting of 2.5-6.0 micron recycled glass powder, cenospheres, ceramic spheres, steel shavings, ceramic whiskers, mineral fibers, wollastonite, ultra-high molecular weight polyethylene (UHMWPE) microfibers, and carbon fibers;
• (ii). preparing a hydrated UHPC paste by mixing water into the UHPC dry mix, followed by mixing a high-range water-reducing admixture (HRWRA);
• and
• (iii). mixing steel microfibers 13 mm×0.2 mm, 5-10% weight % into the hydrated UHPC paste to obtain a hydrated microfiber UHPC paste;
• wherein a total of all weight % equals 100%.